class Solution {
public:
    int search(vector<int>& nums, int target) {
        int left = 0, right = nums.size() - 1;
        while(left <= right)
        {
            int mid = left + (right - left) / 2;
            if(nums[mid] > target)
            {
                right = mid - 1;
            }
            else if(nums[mid] < target)
            {
                left = mid + 1;
            }
            else
            {
                return mid;
            }
        }
        return -1;
    }
};